| 1. | .i | Analysis data (Phase Vocorder) ◊ Preprocessor output file (Borland C++ Preprocessor) |
| 2. | .i16 | Nokia Logo File |
| 3. | .i3 | Interface source (Modula-3) |
| 4. | .ian | Text file (Sterling Software, Groundworks COOL Business Team Model) |
| 5. | .iax | Bitmap graphics (IBM Image Access eXecutive file) |
| 6. | .#ib | Printer data file (LocoScript) |
| 7. | .ibg | Bitmap graphics - planetary images by NASA (PDS format) |
| 8. | .ibm | Compressed file archive (Internal IBM only) (ARCHDOS) |
| 9. | .iby | ROM image component include file |
| 10. | .ic | Initial Condition (Spice) ◊ M3CG intermediate language file (Modula-3) |